The next step is to sew around the lines on the blanks. I sew as close to the line as I can, just inside the line. After going around once, I sew another stitch line 1/4" inside of that. If I line up the groove between the part of the welt foot that is attached to the needle bar and the right side of the outside foot, that works pretty well for getting close to the line. For the second line, I line up that right side of the outside part of the foot in the groove the first stitch line made. This makes it easy to follow. As you can see, I marked the top of all the pieces so nothing gets sewed in upside down. The center piece needed to finish at 11". When you sew the fabric or vinyl down to the foam, it shrinks slightly. I marked the center section at 11 3/16", and after sewing the perimeter, it is exactly the right size. If you are going to sew vertical lines, make sure you make your blanks wider to allow for this shrinkage. The center picture shows how all your pieces should look around the outside edge after you trim off the excess foam and fabric. I cut as close to the outside of the stitch line as I can with a scissors, angling the scissors slightly to the outside.